I'm searching for the episode of scrubs where they get an air band together and at the end they play air instruments to "More Than A Feeling" by Boston.
"My Half-Acre" (Season 5, Episode 9) .
.D. meets the klutzy Julie, and when he becomes smitten, Elliot attempts to help out with romance advice; Carla tries to find Cox's soft side when he refuses to kiss his son; Turk and Janitor put together an air band to win a contest, but Kelso gives them a tremendous obstacle.
Here it is: